What are some things that guys do when they like a girl?

Personally before I met my girlfriend I would talk and joke around with the girls I liked more than others. I would actually give them more attention and compliment them instead of being perverted like most guys. For girls, it would be hard to tell if a guy was messing with you or not. It may take some time but, next time you see him, observe the people he talks with and find out if your the only one he flirts with or if it's more of a group thing for him.

If he goes out on a limb just to talk with you (not necessarily flirt), or if he gives you more attention than other girls,then he might genuinely have feelings for you. If you have the courage, talk to him about it. If not, just sit back and see how he acts around other girls and not just yourself.